A valid point. I don't mind hoaxes too much though, because a) they incrementally improve editing standards on WP and b) I'm starting to think that the form of someone's reaction to WP tells you a lot about their thinking process, or lack thereof.
Yeah, I don't really have a problem with the editing standards on Wikipedia. The article mentions that the changes where almost immediately reversed several times.
Right now encyclopedia companies seem to be operating on accuracy through obscurity, believing that if they control who edits the textbook, the results would have an acceptable level of accuracy. And that method can get good results. But that also means open encyclopedias will be viewed as more inaccurate for awhile, which means the errors are more public. I'm sure that everyone has had teachers complain about the accuracy of some textbooks, but those errors don't usually make news stories.
So I see hoax edits as somewhat comparable to a programmer intentionally putting a back door or easily exploitable code into open source software. The attempt could bring up problems with the code submittal process, and I'm sure that most well-run projects would quickly fix the error. But if the media got a hold of the story, it would not help convince technical managers and CIOs to take open source software seriously.